package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.time.LocalDateTime;


/*
 *自定义切面类，实现公共字段的填充逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        //获取方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获取方法头上的注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();
        //获取被拦截方法的实际参数-实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //通过反射注入数据
        if (OperationType.INSERT == operationType) {
            try {
                Method setCreateUserMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setCreateTimeMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateUserMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setUpdateTimeMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                setCreateUserMethod.invoke(entity,currentId);
                setCreateTimeMethod.invoke(entity,now);
                setUpdateUserMethod.invoke(entity,currentId);
                setUpdateTimeMethod.invoke(entity,now);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (OperationType.UPDATE == operationType) {
            try {
                Method setUpdateUserMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setUpdateTimeMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                setUpdateUserMethod.invoke(entity,currentId);
                setUpdateTimeMethod.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
}
